Core-lifter for diamond drills.



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GRE METER POR DAMND ERILLS.

Sm aras Patented January 10, 1905.

PATENT OFFICE.

DAVID DUPUIS, 0E SALT LAKE CITY, UTAH, ASSIGNOR OF ONE-HALF T() D. A.CARPENTER, 0F EL PASU, TEXAS.

COHEMLIIFTEFI FUR DIAMOND DFHLLS.

SPECIFICATION forming part of Letters Patent No. 779,995, dated January10, 1905.

Application iiledAugust 9, 1904. Serial No. 220,147.

Be it known that I, DAVID I)UrUIs, a citizen of the United States,residing at Salt Lake City, in the county of Salt Lake and State ofUtah, have invented certain new and useful Improvements in Core-Liftersfor Diamond Drills; and I do declare the following to be a full, clear,and exact description ofthe invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

My invention relates to improvements in diamondfdrill apparatus, andmore particular-ly to the core-lifting device used in connection withthe shell, the bit, and core-barrel. The construction of the core-lifteris believed to benovel, and I have also shown a novel construction ofbit, in that the interior wall of the bit is beveled, corresponding withthe bevel of the shell, so that the core-lifter may drop into the bit,thus enabling the lifter to grasp the core near the rock or lower eX-tremity of the core. This feature is of some importance, particularly asit enables the lifter to take better hold or grasp the smaller' piecesof core which occur in broken ground.

My improved core-lifter consists of two members, one of which isprovided with ears engaging' a counterpart recess formed in the othermember, the engaging edges of the ears of one member forming the are ofa circle to engage a corresponding recess formed in the other member,whereby the two members are capable of a rocking movement the one uponthe other, as circumstances may require, whereby the members are allowedto adjust themselves upon the core and by their gripping action causethe latter to be broken ofi" and raised as the core-barrel, the shell,and the bit are lifted.

An important feature of the device consists in the fact that one of thecorelifter members is larger than the other-that is to say, one of themin end View forms a little more than half of the circle formed by thetwo members, while the other member forms less than half the circle. Thereason for this is that if as the core passes up through the largeportion any dirt should accumulate between the smaller portion and thecore, thus preventing the gripping of the core, the larger part willstill hold it, break the core off, and bring it to the surface in thecore-barrel, since the core cannot get out of the larger lifter memberby a lateral movement, as the said member passes more than half-wayaround the core.

Having briefly outlined my improved construction, as well as thefunction it is intended to perform, I will proceed to describe the samein detail, reference being' made to the accompanying drawings, in whichis illustrated an embodiment thereof.

In the drawings, Figures l and 2 are top plan and sectional views,respectively, of the core-lifter, Fig. 2 being' a section taken on theline 2 EZ, Fig. 1. Fig. 3 shows the core- 70 shell in detail and incombination with my mproved core-lifter. In this view the ordinaryconstruction of shell is employed. Eig. 4 is a sectional Viewillustrating the core-barrel, core-shell, and bit, together with myimproved 7 5 construction of core-lifter. In this view my specialconstruction of bit is also shown. Fig. 5 is a similar View showing theparts in position when the core is broken olf and partly lifted out ofthehole. Otherwise the 8O construction is the same as shown in Fig. LI.Fig. 6 is a detail view showing in full lines the bit illustrated bydotted lines in Fig. 3.

The same reference characters indicate the same parts in all the views.35

Let A designate the core-barrel; B, the

core-shell; C, the bit, and E the core-lifter. In this case the barrelis of ordinary construction. The shell is screwed to the lower extremityof the barrel in the usual manner. The bit is also connected with thelower extremity of the shell by screw-threads. In the form shown inFigs. 4L and 5 the interior bevel of the bit harmonizcs with thecorresponding bevel of the shell, which permits the corelifter to dropinto the bit as occasion requires, whereby the lifter is adapted tograsp smaller pieces of core than would be the case in the vshape formedin the member E.

two members when connected in interlocking relation, as shown in Figs. land 2, form the arc of a complete circle, except that there is a smallbreak between the members which permits a rocking movement. The member Eforms slightly more than half of the circle, while the member E2 formssomewhat less than half the circle. The member E2 has a lug E3,\vliichengages a recess Ei of counterpart The ear E3 is circular on itsengaging edge, whereby the members are allowed to rock freely upon eachother to a limited extent in the performance of their core-grippingfunction.

The form of shell shown in Fig. 8 will be designated B', since aslightly-modified form of construction is illustrated. The core-lifter,however, shown in Fig. 3 is of the same construction as that shown inthe other views. The bit shown in Fig. 6 will be designated C', as it isof a slightly-dierent construction from that shown in the other views.

In the drawings the letter F designates the formation in which the holeFl is formed,while G designates the core which is formed by the rotationof the bit, whose lower extremity is provided with cutting devices, asblack diamonds.

From the foregoing description the use and operation of my improveddevice will be readily understood. As the core-barrel, shell, and bitare rotated the core G is formed and passes up through the said parts.When a sufficient length of core has been formed or when it is no longerpracticable to continue the operation without removing the core, thecorebarrel is lifted,which causes the shell by virtue of its bevel toact on the exterior beveled walls of the core-lifter, whereby the latteris made to grip the core, which is then broken ottA and raised out ofthe hole in a manner that will be readily understood` It is evident thatif for any reason the member E2 of the core-lifter should fail to gripthe core the member E will grip it and cause it to be lifted out of thehole, since the core cannot slip laterally out of the core-lifter memberE', as the latter reaches more than half-way around the cylindricalcoref This is an important feature of my construction.

Having thus described my invention, what I claim isH l. A core-lifterconsisting of two members one of which is larger than the other andadapted to pass more than half-way around the cylindrical core to belifted.

2. A core-lifter consisting of two interlocking members one of themembers having ears and the other, recesses which the ears engage, theengaging edges of the ears and the walls of the recesses being circularin shape whereby the members are permitted a rocking movement.

3. A core-lifter comprising two coperating interlocking members capableof a rocking movement, the said core-lifter being exteriorly beveled andinteriorly cylindrical, the one member being larger than the other forthe purpose set forth.

4. A core-lifter comprising two coperating members connected to have alimited rocking movement, the said lifter being interiorly cylindrical,and of frusto-conical shape exteriorly.

In testimony whereof ailx my signature .in presence of two witnesses.

DAVID DUPUIS.

lVitnesses:

P. J. SHAVER, IV. A. BONNET.

